/Engine/Source/Runtime/AudioExtensions/Public/ISoundfieldFormat.h
void TranscodeAndMixIn ( const [ISoundfieldAudioPacket](API\Runtime\AudioExtensions\ISoundfieldAudioPacket) & InputData, const [ISoundfieldEncodingSettingsProxy](API\Runtime\AudioExtensions\ISoundfieldEncodingSettingsProxy) & InputSettings, [ISoundfieldAudioPacket](API\Runtime\AudioExtensions\ISoundfieldAudioPacket) & PacketToMixTo, const [ISoundfieldEncodingSettingsProxy](API\Runtime\AudioExtensions\ISoundfieldEncodingSettingsProxy) & OutputSettings )